Loose-leaf binder



" W. VENNARD Oct. 22, 19429.

LOOSE LEAF BINDER Filed Nov. 16. 1928 3. z /i w di, z C 2M: 1 5 M /C Lim Www-1 Patented Oct. 22, 1929 PATENT OFFICE WILLIAM VENNARD, OF KINGSCROSS, LONDON, ENGLAND LOOSE-LEAF BINDER Application led November 16,1928, Serial No The present invention relates to improvements in orrelating to loose leai' binders oi the kind in which the covers areconnected together by thongs on which the sheets are removably mounted,and the thongs are tensioned or relaxed by means of a stretcher barwhich is actuated by hand, means being' provided for locking thestretcher bar in the position in which it is desired to be set.

An object of the present invention is to provide a locking mechanismwhich is simple in character and by means oi which the locking andunlocking' is expeditiously carried out.

In the drawings Fig. l is a plan view of a binder with the covers fullyopen to show the general arrangement oi the invention.

Fig. 2 an under plan view on a larger scale 2D of the locking mechanismin the released posi tion and Fig. 3 a similar view with the locking`mechanism in action.

Fig. 4 is a transverse section through the line l-fl of Fig. l, but on alarger scale.

In the construction illustrated by the draw ings the stretcher bar l isarranged to slide on a guide member 2 bar and slipper fashion, and meansare provided on the stretcher bar for setting up a friction grip betweenthis se andthe guide-bar so as to produce a clamping' lock for locking`the stretcher bar in the position in which it is desired to be set.

The friction grip is provided by means oi acam lever grip, the cam 3being rotatably mounted on the stretcher bar l, and the actuating arm orlever l turning in a plane parallel with and adjacent to the plane ofthe stretcher bar.

The slide-guide-bar passes through a pair of spaced parallel slides 5suitably l'ormed or provided on the underside of the stretcher barintermediately of the ends thereof, and the cam 3 is located in aposition to one side of the guide-bar, so that the cam is adapted onrotation to set up a friction `srrip on the `guide-bar. Rotation ot thecam is effected by the thumb or finger arm or lever 4 xed to the axis ofthe cam from the upperside oi the stretcher bar.

As shown the cam itself has means for lim- 319,?93, and in Great BritainAugust 20, 1928.

iting the movement when unlocking. The edge adjacent the lower step oi'the cam (Fig. 8) is arranged to Contact with the guidebar as shown inFig. 2 and prevent :further movement of the cam when this has been movedto the unlocked position.

The present invention thus realizes a simple, dependable, inexpensivehand operated thongmechanism with a locking action which eliminates thesemi-positive character of locking mechanisms which involve the use ofsprings.

What I claim is 1. In a thong loose-leaf binder of the characterdescribed, the combination with a stretcher bar for the thongs, of aguide member on which said bar runs, a pivot member extending throughthe stretcher bar, a cam attached to said pivot member on one side ofsaid stretcher bar, and an actuatinp,` arm for said cam attached to saidpivot member on the other side ot said stretcher bar, said camcooperating` with said guide member to lock the stretcher bar in theposition in which it is desired to be set.

2. In a loose-leaf binder according to claim l, a part on said camcontactingl with the guide bar for limiting the movement of the cam whenunlocking.

In testimony whereof, I ailix my signature.

WILLIAM VENNARD.

